在excel中写入activecell

Question

我有以下代码将值写入excel中的activecell。它可以在50％的时间内正常工作，但不是最后的50％。 为什么？

void ValueToExcel(string value)
{

   Excel.Application oXL=null;
   Excel.Workbook oWB=null;
   Excel.Worksheet oSheet=null;
   Excel.Range rng =null;
   try
   {
      oXL = (Excel.Application)Marshal.GetActiveObject("Excel.Application");
      oXL.Visible = true;
      oWB = (Excel.Workbook)oXL.ActiveWorkbook;
      oSheet = oWB.ActiveSheet;                
      rng = oSheet.Application.ActiveCell;                
      rng.Value = value;
      rng.Application.ActiveCell.Offset[1, 0].Select();
   }
   catch (Exception EX)
   {
      MessageBox.Show(EX.Message);
   }
}

我尝试更改代码，但仍无效。似乎该值被写入其他一些Excel应用程序。

void ValueToExcel(string value)
{
   //Gets Excel and gets Activeworkbook and worksheet
   Excel.Application oXL=null;
   Excel.Workbook oWB=null;
   Excel.Worksheet oSheet=null;
   Excel.Range rng =null;
   try
   {
      while (oXL==null)
         oXL = (Excel.Application)Marshal.GetActiveObject("Excel.Application");

      oXL.Visible = true;

      while (oWB == null)
         oWB = (Excel.Workbook)oXL.ActiveWorkbook;

      while (oSheet == null)
         oSheet = oWB.ActiveSheet;

      while (rng == null)                
         rng = oSheet.Application.ActiveCell;

      while(rng.Value=="")
         rng.Value = value;

      MessageBox.Show(value);

      Console.Beep();

      rng.Application.ActiveCell.Offset[1, 0].Select();
   }
   catch (Exception EX)
   {
      MessageBox.Show(EX.Message);
   }
}

有人帮忙吗？